Name: Pelagic Fish Biomass Survey on the Africana Voyage 097, November 1991
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/DEA.MIMS.45072024

Title	Pelagic Fish Biomass Survey on the Africana Voyage 097, November 1991
Authors	Kevern Cochrane Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), South Africa
Publisher	Department of Forestry, Fisheries and the Environment (2024)
Contributors	Project Leader: Gavin Tutt Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), email: gtsglider@gmail.com Project Leader: Tarron Lamont Oceans and Coastal Research, Department of Forestry, Fisheries and the Environment (DFFE), email: tarron.lamont@gmail.com
Abstract	The Pelagic Fish Biomass Survey was conducted on the Africana Voyage 097 from 07 November to 03 December 1991. The objectives of the cruise were to estimate the biomass and population length structure of anchovy, pilchard, and round herring off South Africa by means of echo-integration and midwater trawling; to estimate anchovy biomass by means of the egg production method, and trial estimate pilchard biomass by means of the egg production method; to describe the distribution and behaviour patterns of commercially harvested epi-pelagic and meso-pelagic fish, and the influence of oceanographic variables on these; to collect biological data on reproduction, condition and diet of pelagic fish species; to determine phytoplankton biomass in the nanophytoplankton (<10 µm) and netphytoplankton (>10 µm) size-classes in surface waters; to obtain information on the distribution and abundance of meso-zooplankton; to estimate secondary production rates of adult copepods using the egg production method; to investigate relationships between water temperature, phytoplankton size, phytoplankton biomass, copepod biomass and production, and the distribution of pelagic fish; the examination of feeding ecology and food production selection of pilchard; the retrieval of a current meter mooring off Cape Columbine; and profiling of currents by means of the acoustic doppler current profiler.
Data	Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) Cite 10.15493/DEA.MIMS.45072024 Style Terms of use These data are made available with the express understanding that any such use will properly acknowledge the originator(s) and publisher and cite the accession numbers and/or associated Digital Object Identifiers. Anyone wishing to use these data should properly cite and attribute the data providers listed as authors in the metadata provided with each dataset. It is expected that all the conditions of the data license will be strictly honoured. Use of any material herein should be properly cited using the dataset’s persistent identifiers such as accession numbers and DOIs. I agree to the terms of use
Temporal extent	07 Nov 1991 – 03 Dec 1991
Geographic extent	North: -31.0 South: -37.0 West: 16.5 East: 24.5
Keywords	Africana, Africana 097, cruise report, sailing orders
Related resources	Digital objects included in this collection: Processed CTD continuous observations from the Pelagic Fish Biomass Survey on the Africana Voyage 097, November 1991 (10.15493/DEA.MIMS.46072024) Processed CTD discrete observations from the Pelagic Fish Biomass Survey on the Africana Voyage 097, November 1991 (10.15493/DEA.MIMS.47072024)

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